Synthetic resin skidproof device

Abstract

In a skidproof device continuously molded of synthetic resin and adapted to be used with a disposable companion sheet product, a multiplicity of skidproof engaging elements are molded on the front surface of a substrate sheet for mating with engaging elements of the companion sheet product. Each skidproof engaging element is composed of a single stem, at least two necks branched and gently sloping upwardly from an upper end of the stem, and at least two heads extending one from an upper end of each neck with an upward gentle slope. Each head has on its top an upwardly convex arcuate surface. Having the differently directed engaging elements, the front surface of this device is smooth in touch and non-directive to give adequate resistance to skidding.

What is claimed is: 
     
       1. A synthetic resin skidproof device that is comfortable to the touch and has a durable structure, comprising: (a) a substrate sheet; and   (b) a multiplicity of skidproof engaging elements molded on a front surface of said substrate sheet and adapted to be mated with a companion sheet product, each of said skidproof engaging elements being composed of a single stem, at least two necks branched and sloping upwardly from an upper end of said stem, and at least two heads extending one from an upper end of each of said necks with an upward slope, each of said heads having on its top an upwardly convex arcuate surface, each of said heads extending from a respective one of said necks in a direction continuously away from said substrate sheet.   
     
     
       2. A synthetic resin skidproof device according to claim 1, wherein each of said skidproof engaging elements has at a branching portion of said necks a concave arcuate surface, and the center line of each of said heads is curved upwardly. 
     
     
       3. A synthetic resin skidproof device according to claim 1, wherein a thickness W1 of said stem of each said skidproof engaging element in a direction of branching of said necks is 0.3-2.0 mm, a thickness W2 of said necks of each said skidproof engaging element in a direction perpendicular to the direction of branching is 0.1-1.5 mm, a height H between said front surface of said substrate sheet and an uppermost point O of each said head is 0.2-2.0 mm, and a distance L1 between respective distal ends of said heads branched in opposite directions from the same stem is 0.4-3.8 mm. 
     
     
       4. A synthetic resin skidproof device according to claim 1, wherein the number of said heads of each said skidproof engaging element is two which are directed in opposite directions. 
     
     
       5. A synthetic resin skidproof device according to claim 1, wherein a radius R1 of curvature of said arcuate surface of said top of each said head is at least 0.04 mm, a radius R2 of curvature of said arcuate surface of said branching portion of said necks of each said skidproof engaging element is at least 0.02 mm. 
     
     
       6. A synthetic resin skidproof device according to any one of claims 1-5, wherein an angle θ between said necks branched oppositely from the same stem is 30°-120°. 
     
     
       7. A synthetic resin skidproof device according to any one of claims of 1-5, wherein a density of said skidproof engaging elements on said front surface of said substrate sheet is 4-720/cm 2 . 
     
     
       8. A synthetic resin skidproof device according to any one of claims 1-5, wherein said substrate sheet has in said front surface a multiplicity of recesses, said skidproof engaging elements rising upwardly from bottom surfaces of said recesses.